Alternate members shall serve in the absence, unavailability or inability of a regular member of the Zoning Board of Appeals to serve. Copies of notices shall be sent to all members, including alternate members. All alternate members are required to appear for all duly noticed meetings. When a meeting of the Board of Appeals shall be duly noticed and called for discussion, if it shall become apparent that a regular member of the Zoning Board of Appeals will be unable to hear and deliberate upon an application, then an alternate member of the Zoning Board of Appeals, at the call of the Chairperson of said Board, shall be duly authorized to hear said application, to deliberate and to vote with full force and effect as if duly appointed a regular member of said Board.